Emery m



(No Model.) 1

E. M. HAMILTON.

TELEGRAPH SOUNDERQ,

Patented Mar. 6, 1888.

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UNITED STATES PATENT OFFICE.

EMERY M. HAMILTON, OF NEW YORK, N. Y.

TELEGRAPH-SOUNDER.

SPECIFICATION forming part of Letters Patent No. 379,064, dated March 6,1888.

Application filed March 13, 1885. Renewed August 29, 1887. Serial No.248,165. (No model.)

To aZZ whom it may concern..-

Be it known that I, EMERY M. HAMILTON, of the city of New York, in thecounty and State of New York,and a citizen of said State, have inventedcertain Improvements in Telegraph-Sounders, of which the following is aspecification, reference being had to the ac-v nation, with thevibratory armature-lever having said stops and retracting-spring, of thepointed fulcrum-pins hereinafter particularly described,suitablysupported beneath the said lever and engaging the hereinafter-describedrecesses or depressions on the under face of said lever, all as and forthe purpose specified, and as more at length recited in the claim.

The usual way of pivoting the said lever in the class of instrumentsreferred to is by means of trunnions projecting from the sides of i thelever, or by screw-shafts with tapering or conical ends that entercorrespondingly-shaped recesses in the ends of the trunnions, which havea rotary motion on the said points. I have heretofore made animprovement in the fulcruming of this class of levers, for which UnitedStates Letters Patent No. 269,521 were granted to me December 26, 1882,said improvement consisting in pivoting the lever upon a sharp-edged ribextending transversely across the body of the lever and entering acorrespondingly-shaped groove in the face of the lever.

My present fulcrum-joint differs from both of the above named. Itconsists of two sup ports with conical or tapering ends, upon or againstwhich the lever rests or on which it vibrates, the lever being providedwith correspondingly-shaped recesses or indentations, into which thesaid supporting-points enter.

Referring to the drawings, A is the vibrating lever of atelegraph-sounder, B being the magnet, and 0 its armature, attached tosaid lever, all mounted on a suitable base,D. This lever is fulcrumed ontwo supports, a a, (shown in dotted lines in Figs. 2 and 3,) which maybe parts that rise from the base D, but are preferably two short shaftsor pins set in ribs or projections b 12, formed on and integrally a partof the casing of the magnet B,the said pins each being provided with acollar near its outer extremity that rests down upon the end of saidrib. The outer ends, a a of the said pins are conical or tapered topoints. The lever A is preferably cruciform, as shown in the drawings.The ends of the crossbar d extend over the points a a, so as to restthereon, and are provided with tapering indentations or recesses e e,toreceive the points of the pins a a. The bottom of the recesses and theextremities of the points are preferably slightly rounded, as plainlyseen in Fig. 3. The angle of the points is slightly more acute than thatof the recesses, so as to permit the free vibration of the lever on thepoints.

E is a spiral spring, one end of which is at tached to the short endlever at f, and the other is wound onto a suitable rotary shaft,F, bywhich the tension of the spring is regulated in the usual way. The end 9of the long arm of the lever is arranged to vibrate between the stops orheads h h, that are vertically adj ustable, by means of screw-threads,on a standard, G, that rises from. the base D, the stops limiting themovement of the lever giving the sound in telegraphing. It is obviousthat by this construction and arrangement of parts the lever iscontinually under the stress of the said spring, acting to press it uponthe points a a, which pressure is increased by the movement of thearmature, under the influence of the magnet, in making the downstroke ofthe lever.

The most important advantages of the described fulcrum-joint over otherfulcrum-joints heretofore used for the levers in this class ofinstruments are, first, that actual and uniform contact of the parts isinsured in the joint,and without any readjustment of the parts after theinstrument is made; second, all lateral shifting or movement of thelever is entirely obviated, and the vibration of the lever, always inone and the same plane, is secured;

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third, if any Wear in joints occurs, such Wear instrument having anarmatureiever vibradoes not in any degree impair the working of torybetween stops and provided with a rethe lever; and fourth, these jointsare easily and cheaply made.

The instrument I have shown in the drawings is a telegraph-sounder; butit is obvious that the described fulcrumjoints are adapted I to be usedon all analogous instruments, such as telegraph-keys, relays, &c.

\Vhat I claim as my invention, and desire to secure by Letters Patent,is

In a telegraph-sounder or other telegraphtracting-spring, thecombination, with the ar mature-lcver and its stops andretractingspring, of conical-ended fulcrum-points supported beneath thelever and recesses in the under face of said lever adapted to engagesaid points, as and for the purpose specified.

EMERY M. HAMILTON. I11 presence of- A. G. N. VERMILYA, HENRY EIOHLING.

